The Thermal Stability and Photoluminescence Degradation of Mn ²⁺ in Fluorescent Lamp used BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ Phosphor

Abstract

The thermal stability and photoluminescence degradation of Mn 2+ in fluorescent lamps used BaMgAl 10 O 17 : Eu 2+ , Mn 2+ phosphor are investigated. The detection of impurity containing manganese with high valence demonstrates the oxidation of Mn 2+ during baking process at 700°C and it partly leads to emission degradation of Mn 2+ . The emission of Mn 2+ mainly originates from the energy transfer of Eu 2+ → Mn 2+ . The oxidation of Eu 2+ decrease the amount of Eu 2+ centers and thus finally causes the degradation of Mn 2+ . Some traps are revealed to be induced during baking process and it further weakens energy transfer efficiency of Eu 2+ → Mn 2+ and decreases the emission of Mn 2+ .